{"title":"Influence of Liquid Viscosity on Swallowing Dynamics in Healthy Adults: A Study Using a New Noninvasive Laryngeal Motion Evaluation Instrument","authors":"Yuta Nakao, Tomoyuki Haji","doi":"10.1111/joor.70009","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Background</h3>\n \n <p>A noninvasive laryngeal motion evaluation device using photoelectric distance sensors (Nodomiru) has been newly developed and reported to be useful in evaluating swallowing dynamics. This device can easily obtain a laryngeal movement velocity curve and a laryngeal movement position curve. In this study, we aimed to examine how liquid viscosity affects the swallowing dynamics after verifying the usefulness of data smoothing in this measurement.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>This study included 33 healthy adults (mean age: 28.8 ± 9.7 years). They were instructed to swallow saliva and 3 mL of thin and medium-thickened liquids three times each in a sitting position. Laryngeal movements during these trials were evaluated using Nodomiru. The comma-separated value data output, which included laryngeal position and time information obtained from Nodomiru, were used to calculate the following parameters: laryngeal elevation time, elevation distance, velocity and laryngeal elevation persistence time with and without smoothing.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>The intraclass correlation coefficient values of elevation peak velocity for the three swallowing trials of liquids were higher with smoothing (0.77) than without smoothing (0.54). Elevation peak velocities were 128.9 ± 56.8, 149.8 ± 47.2, and 173.5 ± 62.7 mm/s for saliva, thin liquid (water), and moderately thick liquid, respectively, demonstrating significant differences.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>Using a smoothing procedure is beneficial for analysing the swallowing dynamics with Nodomiru. Furthermore, increasing liquid thickness promoted increased laryngeal movement velocity in healthy adults.</p>\n </section>\n </div>","PeriodicalId":16605,"journal":{"name":"Journal of oral rehabilitation","volume":"52 11","pages":"1965-1971"},"PeriodicalIF":4.0000,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of oral rehabilitation","FirstCategoryId":"3","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/joor.70009","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 0
Abstract
Background
A noninvasive laryngeal motion evaluation device using photoelectric distance sensors (Nodomiru) has been newly developed and reported to be useful in evaluating swallowing dynamics. This device can easily obtain a laryngeal movement velocity curve and a laryngeal movement position curve. In this study, we aimed to examine how liquid viscosity affects the swallowing dynamics after verifying the usefulness of data smoothing in this measurement.
Methods
This study included 33 healthy adults (mean age: 28.8 ± 9.7 years). They were instructed to swallow saliva and 3 mL of thin and medium-thickened liquids three times each in a sitting position. Laryngeal movements during these trials were evaluated using Nodomiru. The comma-separated value data output, which included laryngeal position and time information obtained from Nodomiru, were used to calculate the following parameters: laryngeal elevation time, elevation distance, velocity and laryngeal elevation persistence time with and without smoothing.
Results
The intraclass correlation coefficient values of elevation peak velocity for the three swallowing trials of liquids were higher with smoothing (0.77) than without smoothing (0.54). Elevation peak velocities were 128.9 ± 56.8, 149.8 ± 47.2, and 173.5 ± 62.7 mm/s for saliva, thin liquid (water), and moderately thick liquid, respectively, demonstrating significant differences.
Conclusions
Using a smoothing procedure is beneficial for analysing the swallowing dynamics with Nodomiru. Furthermore, increasing liquid thickness promoted increased laryngeal movement velocity in healthy adults.
期刊介绍:
Journal of Oral Rehabilitation aims to be the most prestigious journal of dental research within all aspects of oral rehabilitation and applied oral physiology. It covers all diagnostic and clinical management aspects necessary to re-establish a subjective and objective harmonious oral function.
Oral rehabilitation may become necessary as a result of developmental or acquired disturbances in the orofacial region, orofacial traumas, or a variety of dental and oral diseases (primarily dental caries and periodontal diseases) and orofacial pain conditions. As such, oral rehabilitation in the twenty-first century is a matter of skilful diagnosis and minimal, appropriate intervention, the nature of which is intimately linked to a profound knowledge of oral physiology, oral biology, and dental and oral pathology.
The scientific content of the journal therefore strives to reflect the best of evidence-based clinical dentistry. Modern clinical management should be based on solid scientific evidence gathered about diagnostic procedures and the properties and efficacy of the chosen intervention (e.g. material science, biological, toxicological, pharmacological or psychological aspects). The content of the journal also reflects documentation of the possible side-effects of rehabilitation, and includes prognostic perspectives of the treatment modalities chosen.